Weyprechtia 381 



11 spines, 2^ Joint of palp distally expanded and fringed in part with setae. 

 Maxiila 2, inner plate with close-set row of setae near the inner margin. Maxilli- 

 peds, inner plates trausverseb truncate, outer scarcely reaching middle of 

 palp's 2^ Joint, wliich is little longer than 1^* or 3^, the finger short, thick, 

 acute. Gnathopods 1 and 2 similar, slender, 5*^ Joint at least as long as 

 6^^, palm ill-defined, finger small. Peraeopods 3 — 5, 2*^ Joint oval. Uropod 2 

 with unequal rami. Uropod 3, rami siugle-jointed, lanceolate, subequal. 

 Telson entire, longer than broad. 



2 species. 



Synopsis of species: 



Side-plate 4 deeply and doubly emarginate 1. W. heuglini . p. 381 



Side-plate 4 simply emarginate 2. W. pinguis . p. 382 



1. W. heuglini (Buchh.) 1874 Ämathilla h., ßuchholz in: Zweite D. Nord- 

 polarf., V.2 p.345 | 1893 A. heuglinii. A. Della Valle in: F. Fl. Neapel, ^\20 p.685 | 1894 

 Weyprechtia heuglini, T. Stebbing in: ßijdr. Dierk., v.ll p. 41 t. 7 | 1880 W. mirabüis, 



Stuxberg in: Bih. Svenska Ak., r. 5 nr. 22 p. 28. 



Integumeut crustaceous, back rounded, broad ; pleon segnaent 4 with trans- 

 verse depression, of which also Segments 1 — 3 show ti-aces. Head dorsally 

 broad, rostrum minute, front angles subtruncate, not very prominent. Side- 

 plates 1 — 3 narrow, truncate below, 1^* with subacute front angle, 4**^ deeper, 

 lower bind angle subacute, a strong downward curved hörn dividing the bind 

 margin into 2 great curves. Side-plates 1 — 5 somewhat projecting laterally, 

 especially the 2 horns or angles of the 4*^. Pleon segments 2 and 3, postero- 

 lateral angles acute, segment 3 having a 2** and somewhat more produced 

 tooth a little way above that of the postero-lateral angle. Eyes reniform, 

 shining, black, curving round from side towards top of head. Antenna 1, 

 1^* Joint scarcely as long as 2*^ and 3*^ combined, flagellum twice as long as 

 peduncle, attaining 32 joints, accessory flagellum 6- or 7-jointed. Antenna 2 about 

 once and a half as long as antenna 1, ultimate and penultimate joints of peduncle 

 equal, flagellum nearly twice as long as peduncle, about 40 — 59-jointed. 

 Upper lip broadly rounded, almost truncate. Mandible, cutting edge appa- 

 rently undivided (in younger specimens perhaps dentate), accessory plate of 

 4 teeth, as usual dissimilar in right and left mandible, 10 spines in spine- 

 row, 3*^ Joint of palp with one margin straight, longer than 2^^ and 3*^ com- 

 bined. Maxilla 1, inner plate with about 30 plumose setae, 2^ Joint of palp 

 distally widened, with several slender spines and setae on inner distal margin. 

 Maxilla 2, inner plate with oblique row of about 30 long plumose setae near 

 inner margin. Maxillipeds, outer plates. apical margin crowded with plumose 

 setae passing over into serrate spines on inner margin." Gnathopod 1, 2*^ Joint 

 the widest, 5*^ Joint naiTOw, longer than 6*^, which is rather long and 

 narrow with small, indistinct palm, finger longer than palm, faintly serrate 

 within, nail curved, acute. Gnathopod 2 similar, but 5**^ Joint more widened, 

 6*^ nearly as long, palm even more indistinct. Peraeopods 1 and 2 slender. 

 Peraeopods 3 — 5 considerably longer, 4^^ and 5*^ subequal, longer than 3**, 

 2'^ Joint not very broadly oval, joints 4 — 7 rather elongate. Uropod 1, rami 

 a little unequal, nearly as long as peduncle. Uropod 2, rami longer than 

 peduncle, inner longer and broader than outer. Uropod 3, rami broad, 

 much longer than peduncle. Telson a little variable, rather longer than 

 broad, tapering to faintly emarginate apex, which canies 2 setules, some- 



